inotify: clean up the inotify_add_watch out path

inotify_add_watch explictly frees the unused inode mark, but it can just
use the generic code.  Just do that.
Signed-off-by: Eric Paris <eparis@redhat.com>

fs/notify/inotify/inotify_user.c

@@ -578,16 +578,13 @@ retry:
 	/* return the watch descriptor for this new entry */
 	ret = tmp_ientry->wd;
 
-	/* match the ref from fsnotify_init_markentry() */
-	fsnotify_put_mark(&tmp_ientry->fsn_entry);
-
 	/* if this mark added a new event update the group mask */
 	if (mask & ~group->mask)
 		fsnotify_recalc_group_mask(group);
 
 out_err:
-	if (ret < 0)
-		kmem_cache_free(inotify_inode_mark_cachep, tmp_ientry);
+	/* match the ref from fsnotify_init_markentry() */
+	fsnotify_put_mark(&tmp_ientry->fsn_entry);
 
 	return ret;
 }